linux-kernel - Re: [PATCH 4/5 ver2] rt2x00: Compiler warning unmasked by fix of BUILD_BUG

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Date:	Tue, 2 Sep 2008 16:27:47 +0200
From:	Ivo van Doorn <ivdoorn@...il.com>
To:	Boaz Harrosh <bharrosh@...asas.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Rusty Russell <rusty@...tcorp.com.au>,
	"David S. Miller" <davem@...emloft.net>,
	"John W. Linville" <linville@...driver.com>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Jan Beulich <jbeulich@...ell.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5 ver2] rt2x00: Compiler warning unmasked by fix of BUILD_BUG_ON

> From: Boaz Harrosh <bharrosh@...asas.com>
> Date: Mon, 1 Sep 2008 14:47:19 +0300
> Subject: [PATCH] rt2x00: Compiler warning unmasked by fix of BUILD_BUG_ON
> 
> A "Set" to a sign-bit in an "&" operation causes a compiler warning.
> Make calculations unsigned.
> 
> [ The warning was masked by the old definition of BUILD_BUG_ON() ]
> 
> Also remove __builtin_constant_p from FIELD_CHECK since BUILD_BUG_ON
> no longer permits non-const values.
> 
> Signed-off-by: Boaz Harrosh <bharrosh@...asas.com>
> TO: Ivo van Doorn <IvDoorn@...il.com>
> TO: John W. Linville <linville@...driver.com>
> CC: Ingo Molnar <mingo@...e.hu>
> CC: Rusty Russell <rusty@...tcorp.com.au>

Thanks.

Acked-by: Ivo van Doorn <IvDoorn@...il.com>

> ---
>  drivers/net/wireless/rt2x00/rt2x00reg.h |    5 ++---
>  1 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/rt2x00/rt2x00reg.h b/drivers/net/wireless/rt2x00/rt2x00reg.h
> index 7e88ce5..2ea7866 100644
> --- a/drivers/net/wireless/rt2x00/rt2x00reg.h
> +++ b/drivers/net/wireless/rt2x00/rt2x00reg.h
> @@ -136,7 +136,7 @@ struct rt2x00_field32 {
>   */
>  #define is_power_of_two(x)	( !((x) & ((x)-1)) )
>  #define low_bit_mask(x)		( ((x)-1) & ~(x) )
> -#define is_valid_mask(x)	is_power_of_two(1 + (x) + low_bit_mask(x))
> +#define is_valid_mask(x)	is_power_of_two(1LU + (x) + low_bit_mask(x))
>  
>  /*
>   * Macro's to find first set bit in a variable.
> @@ -173,8 +173,7 @@ struct rt2x00_field32 {
>   * does not exceed the given typelimit.
>   */
>  #define FIELD_CHECK(__mask, __type)			\
> -	BUILD_BUG_ON(!__builtin_constant_p(__mask) ||	\
> -		     !(__mask) ||			\
> +	BUILD_BUG_ON(!(__mask) ||			\
>  		     !is_valid_mask(__mask) ||		\
>  		     (__mask) != (__type)(__mask))	\
>  


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